Malicious PDF — malware analysis report

Static analysis result for SHA-256 958b5320af184519…

MALICIOUS

PDF

47.0 KB Created: 2021-06-04 00:33:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3585c6c6cd4dac6c7fbf60138cf89bc5 SHA-1: 8cf6daffcf74be13a67df74be40444e4f38bfed5 SHA-256: 958b5320af184519871232859b4ffa91ed9479fd2b005ff1f0ca29ede283e341
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious infrastructure. The document body, though truncated, contains the same URL, reinforcing the lure. This suggests the primary goal is to trick the user into visiting a malicious site, likely to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/406889139/latest-coin-master-free-spins-link-game-hack In PDF document text
    • http://opac.library.uib.ac.id/repository/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/roblox-skin-free_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/minecraft-free-android_GM479516143.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/coin-master-hack-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005246.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5246 24856 bytes
SHA-256: d3cf5e0e24b8b601ddcd334bca1aa53af803d486eda80b60eb96fc07d0a9ee10
font_01_sfnt_off00008b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B99 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off00009584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9584 18056 bytes
SHA-256: cb1252db2fb22e48d32bdc3d2dcea27c54d261741ba9f8603ab19c70b0a9ddfb

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